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Speedlite Transmitter ST-E2


Item Code: 2478A002AA


  • E-TTL Compatible.

  • Built-in AF-Assist Beam.

  • Sets and Controls Flash Ratio.

  • High-Speed FP Flash.

  • E-TTL Wireless Autoflash Control.

This is to make Misc appear on the page when needed.




550EX-dedicated, clip-on Speedlite transmitter with direct contacts

Compatible Cameras

Type A EOS cameras (E- TTL, autoflash); Type B EOS cameras (Manual flash)

Sync Speed

High-Speed Sync (FP flash): Enabled with high-speed sync mode

Flash Exposure Confirmation

1. Before flash fires during FE lock Adequate flash exposure indicated by the flash exposure level icon lit in the viewfinder. Insufficient flash exposure indicated by the flash exposure level icon blinking in the viewfinder.
2. After flash fires ST-E2's flash confirmation lamp lights in green for 3 sec.

AF Assist Beam

Compatible with EOS-3's 45-point Area AF and 28mm and longer lens focal lengths
Effective Range: Approx. 0.6 to 10m/2.0 to 16.5 ft along the periphery (in total darkness).

Wireless Functions

Transmission System

Infrared pulse

Transmission Range

Indoors: Approx. 12-15 m/39.4 - 49.2 ft; Outdoors: Approx. 8-10 m/ 26.2-32.8 ft

Flash Ratio Control

For A:B ratio: 1:8 to 8:1, in half- step increments or 13 steps

Flash Coverage

Transmission Coverage: +/-40 degrees horizontal and +/-30 degrees vertical

Receiver Operation Confirmation

With test transmission button.
*Receiver A fires followed by receiver B at 1/64 output.

Receiver Unit SE Mode Cancellation

Cancels when the test transmission button or FE lock button is pressed to turn on the receiver unit.


Power Source

2CR5 lithium battery x 1
Battery Life: Approx. 1,500 transmissions (At room temperature and with a new set of batteries)

SE Mode

While the power switch is set to I or HOLD, the transmission turns off automatically after about 90 sec. of non-use.


62 (W) x 51 (H) x 80 (D)mm/2.4 (W) x 3.1 (D) in


100g/3.5 oz (excluding battery)



† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.

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